Foot Ulcer: What Patients Need to Know

A foot ulcer is an open sore that develops when the skin and underlying tissue break down, often on pressure points such as the toes, heel, or sole. It can be slow to heal and may become infected, so early assessment and treatment are important, especially for people with diabetes, poor circulation, or nerve damage.

Overview: what a foot ulcer is

A foot ulcer is an open sore or wound on the foot that does not heal normally. It may begin as a blister, callus, crack in the skin, or small area of irritation, then deepen over time. Many ulcers form on places that carry pressure or rub against footwear, such as the ball of the foot, heel, toes, or the side of the foot.

Although anyone can develop a foot ulcer, the risk is much higher in people with diabetes, circulation problems, nerve damage, foot deformities, or reduced mobility. In these situations, a person may not feel pain from a minor injury, or the skin may receive less oxygen and nutrients needed for repair. This can allow a small problem to become a larger wound.

Foot ulcers deserve prompt medical attention because they can become infected or extend into deeper tissues. Early treatment often improves healing and lowers the chance of complications. The goal is not only to close the wound, but also to understand why it developed and prevent it from coming back.

Symptoms and signs to watch for

A foot ulcer may look like a shallow crater, a deeper hole, or an area where the skin has broken down under a callus. The surrounding skin can appear red, swollen, dry, or thickened. Some ulcers produce drainage that stains socks or causes an unpleasant odor.

Pain is possible, but not everyone feels it. People with nerve damage, especially those with diabetes, may have little or no discomfort even when the ulcer is significant. This is one reason regular foot checks are so important. A person may notice warmth, swelling, a change in skin color, or difficulty wearing shoes comfortably before noticing the wound itself.

Warning signs of infection include increasing redness, pus, swelling, foul smell, fever, chills, or red streaking from the wound. Darkening of the skin, new numbness, or sudden worsening can suggest poor blood supply or tissue damage and should be assessed urgently.

• Open sore on the foot, toe, heel, or sole
• Drainage on socks or shoes
• Swelling or warmth around the wound
• Thick callus over or around a sore
• Bad odor, pus, or spreading redness

Why foot ulcers happen: causes and risk factors

Most foot ulcers develop because several factors act together rather than from a single cause. Repeated pressure or friction can injure the skin. If a person also has reduced sensation, they may continue walking on the area without realizing damage is occurring. Over time, skin and tissue break down.

Diabetes is one of the most common underlying conditions linked to foot ulcers. High blood sugar over time can damage nerves and blood vessels, increasing the risk of unnoticed injury and slower healing. People who have diabetes may also be more likely to develop infections once the skin barrier is broken.

Poor circulation is another major factor. When blood flow to the feet is reduced, tissue receives less oxygen and nutrients, making healing more difficult. Smoking, peripheral artery disease, kidney disease, a history of previous ulcers, and certain foot shapes or deformities can further increase risk. Tight shoes, walking barefoot, burns, cuts, and fungal skin changes may also trigger an ulcer in a vulnerable foot.

How doctors diagnose a foot ulcer

Diagnosis starts with a careful medical history and foot examination. The doctor will look at the ulcer’s size, depth, location, drainage, and the condition of the surrounding skin. They may check for signs of infection, dead tissue, pressure points, and whether bone or deeper structures could be involved.

The exam also usually includes testing circulation and nerve function. A clinician may feel pulses in the feet, compare skin temperature, and assess sensation with light touch or simple instruments. These findings help show whether the main problem is pressure, neuropathy, poor blood flow, infection, or a combination of causes.

Additional tests may be needed depending on the situation. Blood tests can help evaluate infection or blood sugar control. Imaging such as X-rays may be used if there is concern about bone involvement or a foreign body. Vascular tests can assess circulation if healing is delayed or pulses are reduced. In people with complex wounds, care may involve diabetes specialists, podiatrists, vascular surgeons, wound-care teams, or orthopedic experts.

Treatment options and what healing involves

Foot ulcer treatment is tailored to the cause, depth, and whether infection or circulation problems are present. Basic wound care usually includes cleaning the ulcer, removing dead tissue when appropriate, protecting the area with dressings, and keeping pressure off the wound. This pressure relief, sometimes called offloading, may involve special footwear, casts, inserts, or activity changes so the skin has a better chance to heal.

If infection is suspected, a doctor may recommend tests and treatment based on the severity and likely bacteria. Blood sugar control is also important for people with diabetes because it supports healing and helps lower infection risk. If an ulcer is linked to poor circulation, treatment may also focus on improving blood flow, sometimes with input from specialists in vascular surgery.

Some patients need more advanced wound management. This may include specialized dressings, regular debridement, treatment of underlying bone or soft-tissue infection, or correction of structural problems that keep pressure on the same area. If diabetes-related complications are present, multidisciplinary care for diabetes management can be a key part of recovery. In selected cases, doctors may recommend imaging such as MRI to better assess deep infection or tissue involvement.

Healing time varies. Small superficial ulcers may improve within weeks, while deeper or infected ulcers can take much longer. Following the treatment plan closely, attending regular follow-up visits, and avoiding unnecessary pressure on the foot can make a meaningful difference.

Prevention and self-care at home

Preventing a foot ulcer often starts with daily habits. Looking at the tops, soles, heels, and spaces between the toes each day can help identify redness, blisters, cracks, swelling, or drainage early. If it is hard to see the bottom of the feet, a mirror or help from a family member can be useful.

Footwear matters. Shoes should fit well, protect the foot, and not create pressure points. Socks should be clean, dry, and changed regularly. Walking barefoot can increase the risk of cuts and punctures, especially in people with reduced sensation. Skin should be kept clean and moisturized, but creams should not be placed between the toes unless advised by a clinician.

General health measures support prevention too. Good blood sugar management, smoking cessation, regular movement as advised, and treatment of corns, calluses, or nail problems by a qualified professional can reduce risk. People with previous ulcers or diabetic neuropathy may benefit from regular foot assessments and a structured prevention plan. If there are concerns about a related diabetic foot problem, early review is especially important.

When to seek medical care

Any new foot ulcer should be assessed by a healthcare professional, particularly in a person with diabetes, poor circulation, or numbness in the feet. Waiting to see if it heals on its own can allow infection or deeper tissue damage to develop. Early treatment is usually simpler and more effective than delayed care.

Prompt medical attention is important if there is increasing redness, swelling, warmth, pus, bad odor, fever, severe or worsening pain, or blackened tissue. Care should also be sought if the wound is getting larger, does not improve, or if the person feels unwell. Emergency assessment may be needed if there are signs of spreading infection or sudden loss of blood flow.

For international patients who need coordinated care, Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat foot ulcers with support from wound care, diabetes, vascular, and imaging teams when needed.

Frequently asked questions

Can a foot ulcer heal on its own?

Some very minor wounds may improve with simple care, but a true foot ulcer should not be left to heal without medical assessment. This is especially important for people with diabetes, nerve damage, or poor circulation, because ulcers can worsen without causing much pain.

Is a foot ulcer always caused by diabetes?

No. Diabetes is a common cause, but foot ulcers can also result from poor circulation, pressure, friction, foot deformities, injury, or reduced mobility. In many patients, more than one factor contributes.

What does an infected foot ulcer look like?

An infected ulcer may have increasing redness, swelling, warmth, drainage, pus, or a bad odor. The surrounding skin may become more tender or discolored, and some people also develop fever or feel generally unwell.

Should a foot ulcer be kept dry or covered?

A foot ulcer usually needs to be protected with an appropriate dressing rather than left open to air. The best dressing depends on the wound, so a clinician should advise on cleaning, moisture balance, and how often to change it.

How long does foot ulcer healing take?

Healing time depends on the ulcer's size, depth, cause, blood supply, and whether infection is present. Some ulcers heal in weeks, while others take much longer and need ongoing specialist care.

Can walking make a foot ulcer worse?

Yes, repeated pressure can delay healing and enlarge the wound, especially if the ulcer is on the sole or heel. Many patients need offloading measures such as special footwear, inserts, or reduced weight-bearing for a period of time.

References

• American Diabetes Association
• Centers for Disease Control and Prevention
• National Institute of Diabetes and Digestive and Kidney Diseases
• National Health Service
• International Working Group on the Diabetic Foot

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.